Deposition of metal or metallic compound upon metals or metallic articles.



- placed in a suitable receptacle and covered with or. packed in a mass of antimony in finely-divided or triturated condition, commercial antimony powder, for example. An-

protective as well as ornamental e ects.

UNITED STATES rurrnrrr OFFICE.

SHERARD COWPER-COLES, OF WESTMINSTER, LONDOI I, ENGLAND.

DEPOSITION 0F METAL 0R METALLIC COMPOUND llPON METALS 0R METALLIC ARTICLES.-

No. seaaaa Specification of Letters Patent.

Patented Aug. 2s. woe.

Application filed Juno 2, 1905. Burial No. 288.895. (Bpoolmenm) T070121 whom it may concern.-

Be it' known that I, SHERARD Cowrna- CoLEs, electrometallur 'st, of 82 Victoria street, Westminster, in t e county of London, En land, have invented certain new and useful dmprovements Relating to the Deposition of Metals or Metallic Com ounds u on Metals or Metallic Articles, of w ich the ollowing is a specification. 7

his invention relates to the coating of metals or metallic articles with metals or metallic compoun'ds,the object bein to obtain 'The invention is especially applicable to the coating with or t e deposition of antimony or a compound containing the same upon metals or metallic articles, which latter may be com osed of iron, steel, cop er, brass, or other suitable metal. Hereto ore it has been the practice in coating metals to subject the articles or metal to be coated to either a hot or a cold galvanizing process the former consisting in immersing the artic e or metal in a bath of the molten coatin metal and the latter consisting in depositm the coating metal upon the article by electro ysis. These processes have roved in many respects unsatisfactory, cause, on the one hand, the process is expensive and an even coatin cannot be assured, while, on the other hand, the coating is not readily ap licablrla to intricate surfaces and articles 0 irre ar configuration.

i ccording to this invention the metal or metallic articles to be coated or to receive the deposit having been subjected to treatment for removal of the scale or oxid is or are timony in this condition contains some oxid of antimony, which renders it particularly adapted for the purposes of the process; but it will be understood that the invention would include metallic antimony with added oxid. It is desirable to exclude the air as far as possible during the process and a closed rece tacle is therefore generally greferable, or,i desired, air may be exhauste from the receptacle or an inert gas pum ed into the same during the treatment. It is also of advantage to rotate or otherwise impart moarticle or artices under treatment shall be maintained in intimate contact with the owdered antimony. For the above reasons it is in general preferred to pack the antimony and articles to be treated in a drum or barrel adapted to be rotated, rocked, or otherwise sub'ected to movement. The receptacle with its contents is heated to a temperature below the melting-point of the antimony or that of a mixture of metallic antimony and antimony oxid, the heating being maintained for a suitable period, say one hour, more or less, according to the thickness or depth of coating it is desired to effect upon the metal or metallic articles under treatment: It has been ascertained as the result of experiment-that in one hour a deposit of about one ounce of antimony per one square foot will be effected. During the he'ating process the drum or receptacle is referably subjected to movement, as herein efore re-.

ferred to. Carbon ma be added to the antimony, but such condition is not indispensable. If em loyed, it may be added in the proportion, or example, of one to six per cent. and in finely-divided condition. It is stated above that the metal or metallic articles rior to being placed in theantimony are freed from scale or oxid. A good coating may be obtained Without removing any grease present on the surfaces of the metal or metalhc articles previous to sub'ecting them to the coating process. When t e process is carried out under proper conditions, a noncrystalline or in some cases a spangled coating of antimony may be obtained, and good results have been secured with antimony powder having a specific gravity of about 3.78 and containing from about twenty to twenty-five per cent. of oxid.

Various results are obtained from powdered antimony containing different proportions of metal and oxid, the temperature bei regulated accordingly.

at I claim, and desire to secure by Letters Patent, isf 1'. The process of de ositing antimony on metallic surfaces whic process consists in applying to the metallic surface pulverulent antimony partially oxidized and in submitting the same to heat.

2. The process of de ositing antimony on metallic surfaces whieli process consists in applying to the metallic surface pulverulent antimony partially oxidized and in submitting the same to heat in a closed chamber.

3. The process of de ositing antimony on metallic surfaces whic process consists in applying to the metallic surface pulverulent antimony partially oxidized and submitting the same to heat in the presence of carbon.

4. The process of de ositing antimony on metallic surfaces whic process consists in applying to the metallic surface what is known in commerce as antimony powder'and in submitting the same to heat.

5. The process of depositing antimony on iron surfaces which process consists in applying to the iron surface antimony powder and in submitting the same to heat.

6. The process of de ositing' antimony on metallic surfaces whic process consists in applying to the metallic surface pulveru'l'ent antimony containing approximately twenty to twenty-five percent. antimony oxid and in submitting the same to heat.

7. The process of de ositing antimony on metallic surfaces whic process consists in applying to the metallic surface pulverulent antimony containing approximately twenty to twenty-five per cent. antimony oxid and in iubmitting the same to heat in a'clos'edcham- 8. The process of de ositing antimony on metallic surfaces whic process consists in sasse applying to the metallic surface pulverulent antimony containing approximately twenty to twenty-five per cent. antimon oxid and submitting the same to heat in t e presence of a small percenta e of carbon.

9. As a new profuct a metallic object with its surface covered with antimony having the following characteristics a homogeneous coating of antimony havi a ph sical connection with'the metal un erneat and having the appearance to the naked eye of a delicate silver-gray and having the distinguishing appearance under the microscope of homo geneous particles free from crystalline structure.

10. Theprocess of coating a metallic surface, which consists in applying to such surface a substance containing antimony in pul- Kerul'en't form, and subjecting the same to eat.

In witnesslwhereof I have hereunto si led my name in the presence of two subscri ing Witnesses.

o QHERARD COWPER-COLES.

Witnesse's:

GORDON MELVILLE CLARK, ROBERT Mmron SPEARPOINT. 

